Periodic Location Update Timer(T3212)

Periodic Location update timer controls periodicity of the location update procedure triggered by Mobile(UE). The value T3212 shall be set to 0 if Peridic location updating procedure need to be disabled. The value can be set in multiples of 6 (6 mins) and default value is 60. When it is set to 60mins, T3212 is set to 10 because T3212 value is in dechours. 1 Decihour = 6mins

Change or add the SMSC number to apple iPhone

How to get the SMSC set in the iPhone?
In the iPhone keypad and type *#5005*7672# Press Call
How to erase the SMSC set in the iPhone?
In the iPhone keypad, type ##5005*7672# Press Call
How to modify the SMSC set in the iPhone?
In the iPhone keypad, type **5005*7672*+# Press Call

Engineering mode/Field test mode in various mobiles using codes

LG Mobile:
Most of the LG Models have similar field test menu:

1. Version
2. Factory Reset
3. Device Test
4. Port Setting
5. Modem Setting
6. SIM Test
7. IMS Setting
8. IM Client ID
   

Engineering mode (field test mode) could be found under Modem Setting. Modem setting has various options including the Network mode, Engineering Mode, GPRS Attach and many more. In some of the LG Models if you want to get into Engineering mode directly using code *748#96


Code:  277634#*#
Model : LG CU720 (LG Shine), LG CU575, LG CU500, LG CU400 (many other models)

Code : 3845#*360#
Model:  LG CF360(This model has more options in the field test mode like GPS, DRM test menus, Calibration data)


Samsung Mobile:
Code: *#0011#
Model: SGH-A707, SGH-A717, SGH-A727, SGH-i617 and many other models support this code.


Apple iPhone:
Code : *3001#12345#* then press call
Various field test information could be seen under the menus.

Blackberry Mobile:
Code: Menu->Settings->Options->status
This would show some of field test information on blackberry phones.


Nokia Mobile:
Code: *3001#12345#.
Code changes on some of the Model. Some time field test displays as Net monitor in Nokia mobiles.  Most of the models like Nokia 12xx, 51xx (except 5125), 61xx, 62xx, 71xx,3285, 63xx are supported with this code. To get out the engineering mode, you need to either dial 00/01 in some models, in some models in net monitor, you many dial 0000.

You contact me if you need more information or field test mode for any other phone/model, I would try to look and get the information back to you.

What is WPS - Wireless Priority Service

WPS means Wireless Priority Service which is priority calling service provided to the subscribers by the operators. This service is add-on service which shall be subscribed by the subscriber.  User must be having WPS feature enabled to make the WPS call.
To make WPS call, dial, *272 + Destination Number

Remember you do not need a special cellphone to make WPS call, only need to subscribed to WPS package from operator. Receiver of the WPS call does not need to subscribe for the WPS feature. *272 enables the priority access to local channels, High probability of completion  features (HPC). If the terminating end is mobile user the then priority channels are allocated for terminating call.

What is AGPS (Assisted GPS)

Assisted GPS is used to assist the GPS by providing the additional information like visible GPS satellites, reference time, Doppler which would help in GPS acquisition process. This feature intern help faster GPS acquiring time and reducing the GPS power consumption. Also helps in more accurate GPS measurements with more coverage.

How to set automatic recovery after power failure for a SUN Netra box using ALOM port command

Pick up a laptop and cable which has RJ-47 in one end and 7-Pin serial port on the other end.

Connect RJ-47 to SERIAL MGT port in the Sun Box and serial port to your laptop. Make sure that you have a application like putty for the serial connection. Serial connection configuration shall be 9600/8n1/none. Establish a serial connection using putty, either console login prompt will appear or ALOM port login prompt appears. Please provide login and password, takes you to ALOM prompt or console window. If you wish to go to ALOM prompt from console then type “#.”(HASH and DOT). If you wish to switch to console prompt from ALOM then type “console”.

How to set automatic recovery after power failure for a SUN Netra box using ALOM port command

Please refer the How to connect to ALOM port section in this website. Once you login to SUN box and able to see the ALOM prompt sc>, you can use setsc command.

sc> showsc
Check the value for sc_powerstatememory variable. It shall show as below:
sc_powerstatememory false
To set the automatic recovery after power failure, do as below
sc> setsc sc_powerstatememory true
For any other commands use showsc and below syntax
sc> setsc <variable> <Value>

AMR: Discontinuous TX (DTX)

Mobile Battery life will be prolonged or a smaller battery could be used for a given operational duration. From the network point of view, the average required bit rate is reduced, leading to a lower interference level and, hence, increased capacity.




How to acheive DTX in AMR?

- Voice Activity Detector on TX side

- Evaluation of the background acoustic noise on the TX side

- Transmission of comfort noise information to the RX side using SID at regular intervals

- Generation of comfort noise on the RX side during periods when no normal speech frames are received.

What is Unlicensed Mobile Access - UMA

UMA provides tunneled IP connection to GSM/GPRS services through WiFi frequencies. But it needs dual mode mobile, to support roaming between wireless networks and unlicensed WiFi networks. UMA Network controller (UNC) is critical network node interworking between tunneled WiFi connection and cellular network.

Picture is referenced from book by Harri Holma and Antti Toskala

What is Push-to-Talk over Cellular (PoC)

PoC is a one way communication over cellular network or called half duplex communication where voice call is full duplex. PoC called as walkie-talkie over PS domain of cellular networks. Best advantage is airtime which would be 1/4th or even less because voice packets transferred only one direction at a time. Radio resources can be allocated and released when needed.